We can use the code I posted a few days ago to convert floating-point numbers to fractions. That will be useful for running the experiment from the original blog post (to approximate pi with varying degrees of accuracy):

Looking at the top 10 most common approximations, you can see the first (and most frequent) result is the exact fractional value of the constant pi, the fourth result is the common "grade school" estimate 22/7, and the second result is the "best" simple estimate 355/113.

Note: the output is slightly different than the Haskell program. Factor considers several of these rational numbers to be equal when converted to floating-point: